AndyGadget
Senior Member
How much of a task would it be to detect 5.4KHz RF pulses over a short distance (1 metre) from a low power transmitter? (Just pulse detection, no encoded data.)
The application is to detect heartbeat pulses from an old-type heart rate monitor belt and feed them into a Picaxe for processing and display during fitness training sessions. Something along the lines of a heart rate monitor watch, but with a larger screen, easily accessible functions and indication for various rate bands during a workout session, to be fitted to a rowing machine.
First thought was to use the old ZN414 receiver chip (or MK484) with suitable coil, but that's only good down to 150KHz. Although I know the basics, detailed RF design is a bit of a hole in my knowledge so can someone give me a pointer as to the degree of difficulty, and if do-able, a useful resource to start from.
Andy.
The application is to detect heartbeat pulses from an old-type heart rate monitor belt and feed them into a Picaxe for processing and display during fitness training sessions. Something along the lines of a heart rate monitor watch, but with a larger screen, easily accessible functions and indication for various rate bands during a workout session, to be fitted to a rowing machine.
First thought was to use the old ZN414 receiver chip (or MK484) with suitable coil, but that's only good down to 150KHz. Although I know the basics, detailed RF design is a bit of a hole in my knowledge so can someone give me a pointer as to the degree of difficulty, and if do-able, a useful resource to start from.
Andy.